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How to use createAssertionError method of io.kotest.assertions.Exceptions class

Best Kotest code snippet using io.kotest.assertions.Exceptions.createAssertionError

StrictThrowableHandling.kt

Source:StrictThrowableHandling.kt

...98   return when {99      thrownThrowable == null -> throw failure("Expected exception ${T::class.bestName()} but no exception was thrown.")100      thrownThrowable::class == expectedExceptionClass -> thrownThrowable as T  // This should be before `is AssertionError`. If the user is purposefully trying to verify `shouldThrow<AssertionError>{}` this will take priority101      thrownThrowable is AssertionError -> throw thrownThrowable102      else -> throw stacktraces.cleanStackTrace(Exceptions.createAssertionError(clueContextAsString() + "Expected exception ${expectedExceptionClass.bestName()} but a ${thrownThrowable::class.simpleName} was thrown instead."))103   }104}105/**106 * Verifies that a block of code doesn't throw a Throwable of type [T], not including subclasses of [T]107 *108 * Use this function to wrap a block of code that you'd like to verify whether it throws [T] (not including) or not.109 * If [T] is thrown, this will thrown an [AssertionError]. If anything else is thrown, the throwable will be propagated.110 * This is done so that no unexpected error is silently ignored.111 *112 *113 * This function won't include subclasses of [T]. For example, if you test for [java.io.IOException] and the code block114 * throws [java.io.FileNotFoundException], propagate the [java.io.FileNotFoundException] instead of wrapping it in an AssertionError.115 *116 * If you wish to test [T] and subclasses, use [shouldNotThrow].117 *118 * If you don't care about the thrown exception, use [shouldNotThrowAny]119 *120 * **Attention to assignment operations**:121 *122 * When doing an assignment to a variable, the code won't compile, because an assignment is not of type [Any], as required123 * by [block]. If you need to test that an assignment doesn't throw a [Throwable], use [shouldNotThrowExactlyUnit] or it's variations.124 *125 * ```126 *     val thrown: FooException = shouldThrowExactly<FooException> {127 *         // Code that we expect to throw FooException128 *         throw FooException()129 *     }130 * ```131 *132 * @see [shouldNotThrowExactlyUnit]133 *134 */135inline fun <reified T : Throwable> shouldNotThrowExactly(block: () -> Any?) {136   assertionCounter.inc()137   val thrown = try {138      block()139      return140   } catch (t: Throwable) {141      t142   }143   if (thrown::class == T::class) throw stacktraces.cleanStackTrace(Exceptions.createAssertionError(clueContextAsString() + "No exception expected, but a ${thrown::class.simpleName} was thrown."))144   throw thrown145}...

CovariantThrowableHandling.kt

Source:CovariantThrowableHandling.kt

...97   return when (thrownThrowable) {98      null -> throw failure("Expected exception ${expectedExceptionClass.bestName()} but no exception was thrown.")99      is T -> thrownThrowable               // This should be before `is AssertionError`. If the user is purposefully trying to verify `shouldThrow<AssertionError>{}` this will take priority100      is AssertionError -> throw thrownThrowable101      else -> throw stacktraces.cleanStackTrace(Exceptions.createAssertionError(clueContextAsString() + "Expected exception ${expectedExceptionClass.bestName()} but a ${thrownThrowable::class.simpleName} was thrown instead."))102   }103}104/**105 * Verifies that a block of code will not throw a Throwable of type [T] or subtypes106 *107 * Use this function to wrap a block of code that you'd like to verify whether it throws [T] (or subclasses) or not.108 * If [T] is thrown, this will thrown an [AssertionError]. If anything else is thrown, the throwable will be propagated.109 * This is done so that no unexpected error is silently ignored.110 *111 * This function will include all subclasses of [T]. For example, if you test for [java.io.IOException] and the code block112 * throws [java.io.FileNotFoundException], this will also throw an AssertionError instead of propagating the [java.io.FileNotFoundException]113 * directly.114 *115 * If you wish to test for a specific class strictly (excluding subclasses), use [shouldNotThrowExactly] instead.116 *117 * If you don't care about the thrown exception, use [shouldNotThrowAny].118 *119 * **Attention to assignment operations**:120 *121 * When doing an assignment to a variable, the code won't compile, because an assignment is not of type [Any], as required122 * by [block]. If you need to test that an assignment doesn't throw a [Throwable], use [shouldNotThrowUnit] or it's variations.123 *124 * ```125 *     val thrownException: FooException = shouldThrow<FooException> {126 *         throw FooException() // Fails127 *     }128 * ```129 *130 * @see [shouldNotThrowUnit]131 */132inline fun <reified T : Throwable> shouldNotThrow(block: () -> Any?) {133   assertionCounter.inc()134   val thrown = try {135      block()136      return137   } catch (e: Throwable) {138      e139   }140   if (thrown is T)141      throw stacktraces.cleanStackTrace(Exceptions.createAssertionError(clueContextAsString() + "No exception expected, but a ${thrown::class.simpleName} was thrown."))142   throw thrown143}...

AnyThrowableHandling.kt

Source:AnyThrowableHandling.kt

...94      return block()95   } catch (e: Throwable) {96      e97   }98   throw stacktraces.cleanStackTrace(Exceptions.createAssertionError(clueContextAsString() + "No exception expected, but a ${thrownException::class.simpleName} was thrown."))99}100/**101 * Verifies that a block of code throws any [Throwable] with given [message].102 *103 * @see [shouldNotThrowMessage]104 * */105inline fun <T> shouldThrowMessage(message: String, block: () -> T) {106   assertionCounter.inc()107   val thrownException = try {108      block()109      null110   } catch (e: Throwable) {111      e112   }113   thrownException ?: throw failure(114      "Expected a throwable with message ${StringShow.show(message).value} but nothing was thrown".trimMargin()115   )116   if (thrownException.message != message) {117      throw stacktraces.cleanStackTrace(Exceptions.createAssertionError(clueContextAsString() + "Expected a throwable with message ${StringShow.show(message).value} but got a throwable with message ${thrownException.message.show().value}".trimMargin()))118   }119}120/**121 * Verifies that a block of code does not throws any [Throwable] with given [message].122* */123inline fun <T> shouldNotThrowMessage(message: String, block: () -> T) {124   assertionCounter.inc()125   val thrownException = try {126      block()127      null128   } catch (e: Throwable) {129      e130   }131   if (thrownException != null && thrownException.message == message)132      throw stacktraces.cleanStackTrace(Exceptions.createAssertionError(clueContextAsString() + """Expected no exception with message: "$message"133                             |but a ${thrownException::class.simpleName} was thrown with given message""".trimMargin()))134}...

failures.kt

Source:failures.kt

...7 * Creates the most appropriate error from the given message, wrapping in clue context(s)8 * if any are set.9 */10fun failure(message: String): AssertionError =11  stacktraces.cleanStackTrace(Exceptions.createAssertionError(clueContextAsString() + message))12/**13 * Creates a [Throwable] from expected and actual values, appending clue context(s)14 * if any are set. The error message is generated in the intellij 'diff' format.15 *16 * This function should be used for "comparison" failures, such as "a" shouldBe "b".17 * For other types of errors (eg timeout, or expected exception but none was thrown) prefer18 * the failure methods that take an explicit message.19 *20 * The given values should have already been [Printed] using the Show typeclass.21 *22 * If the platform supports stack traces,23 * then the stack is cleaned of `io.kotest` lines.24 */25fun failure(expected: Expected, actual: Actual, prependMessage: String = ""): Throwable {26  return stacktraces.cleanStackTrace(27     Exceptions.createAssertionError(28        prependMessage + clueContextAsString() + intellijFormatError(expected, actual)29     )30  )31}32/**33 * Returns a message formatted appropriately for intellij to show a diff.34 *35 * This is the format intellij requires to recognize:36 * https://github.com/JetBrains/intellij-community/blob/5422868682d7eb8511dda02cf615ff375f5b0324/java/java-runtime/src/com/intellij/rt/execution/testFrameworks/AbstractExpectedPatterns.java37 *38 * From the above link:39 * private static final Pattern ASSERT_EQUALS_PATTERN = Pattern.compile("expected:<(.*)> but was:<(.*)>", Pattern.DOTALL | Pattern.CASE_INSENSITIVE);40 */41fun intellijFormatError(expected: Expected, actual: Actual): String {...

clues.kt

Source:clues.kt

...22      errorCollector.pushClue { clue.value.toString() }23      return thunk()24   // this is a special control exception used by coroutines25   } catch (t: TimeoutCancellationException) {26      throw Exceptions.createAssertionError(clueContextAsString() + (t.message ?: ""), t)27   } finally {28      errorCollector.popClue()29   }30}31/**32 * Similar to `withClue`, but will add `this` as a clue to the assertion error message in case an assertion fails.33 * Can be nested, the error message will contain all available clues.34 *35 * @param block the code with assertions to be executed36 * @return the return value of the supplied [block]37 */38inline fun <T : Any?, R> T.asClue(block: (T) -> R): R = withClue(lazy { this.toString() }) { block(this) }39inline fun <T : Any?> Iterable<T>.forEachAsClue(action: (T) -> Unit) = forEach { element ->40   element.asClue {...

MultiAssertionError.kt

Source:MultiAssertionError.kt

...36         }37      }38   }39  errors.firstOrNull { it.cause != null }40  return stacktraces.cleanStackTrace(Exceptions.createAssertionError(clueContextAsString() + message))41}...

Exceptions.kt

Source:Exceptions.kt

...4   /**5    * Creates an [AssertionError] from the given message. If the platform supports nested exceptions, the cause6    * is set to the given [cause].7    */8   actual fun createAssertionError(message: String, cause: Throwable?): AssertionError = AssertionError(message, cause)9   /**10    * Creates an [AssertionError] from the given message and expected and actual values.11    *12    * The exception type is13    *14    *15    * See https://ota4j-team.github.io/opentest4j/docs/1.0.0/api/org/opentest4j/AssertionFailedError.html16    *17    */18   actual fun createAssertionError(19      message: String,20      cause: Throwable?,21      expected: Expected,22      actual: Actual23   ): Throwable = AssertionFailedError(message, cause, expected.value.value, actual.value.value)24}25/**26 * This is our extension of the opentest4j error type which adds the interface [ComparisonError] which27 * is the Kotest multiplatform interface for errors that expose expected and actual values.28 */29class AssertionFailedError(30   message: String,31   cause: Throwable?,32   override val expectedValue: String,...

errors.kt

Source:errors.kt

...26   val message = when (e) {27      is AssertionError -> e.message28      else -> e.toString()29   }30   return stacktraces.cleanStackTrace(Exceptions.createAssertionError(clueContextAsString() + "Test failed for $params with error $message"))31}32@PublishedApi33internal fun forNoneError(headers: List<String>, values: List<*>): Throwable {34   val params = headers.zip(values).joinToString(", ")35   return failure("Test passed for $params but expected failure")36}

createAssertionError

Using AI Code Generation

1val exception = createAssertionError("Expected 3, but was 4")2println(exception.message)3val exception = createAssertionError("Expected 3, but was 4", cause = Exception())4println(exception.message)5val exception = createAssertionError("Expected 3, but was 4", cause = Exception(), expected = "3", actual = "4")6println(exception.message)7val exception = createAssertionError("Expected 3, but was 4", cause = Exception(), expected = "3", actual = "4", showDiff = true)8println(exception.message)9val exception = createAssertionError("Expected 3, but was 4", cause = Exception(), expected = "3", actual = "4", showDiff = false)10println(exception.message)11val exception = createAssertionError("Expected 3, but was 4", cause = Exception(), expected = "3", actual = "4", showDiff = false, diff = "diff")12println(exception.message)13val exception = createAssertionError("Expected 3, but was 4", cause = Exception(), expected = "3", actual = "4", showDiff = false, diff = "diff", diffColorFn = { it })14println(exception.message)15val exception = createAssertionError("Expected 3, but was 4", cause = Exception(), expected = "3", actual = "4", showDiff = false, diff = "diff", diffColorFn = { it }, renderers = listOf())16println(exception.message)17val exception = createAssertionError("Expected 3, but was 4", cause = Exception(), expected = "3", actual = "4", showDiff = false, diff = "diff", diffColorFn = { it },

createAssertionError

Using AI Code Generation

1    Assertions.createAssertionError("message", cause, sourceRef)2    Assertions.createAssertionError("message", sourceRef)3    Assertions.createAssertionError(cause, sourceRef)4    Assertions.createAssertionError(sourceRef)5    Exceptions.createAssertionError("message", cause, sourceRef)6    Exceptions.createAssertionError("message", sourceRef)7    Exceptions.createAssertionError(cause, sourceRef)8    Exceptions.createAssertionError(sourceRef)9    Assertions.createAssertionError("message", cause, sourceRef)10    Assertions.createAssertionError("message", sourceRef)11    Assertions.createAssertionError(cause, sourceRef)12    Assertions.createAssertionError(sourceRef)13    Exceptions.createAssertionError("message", cause, sourceRef)14    Exceptions.createAssertionError("message", sourceRef)15    Exceptions.createAssertionError(cause, sourceRef)16    Exceptions.createAssertionError(sourceRef)17    Assertions.createAssertionError("message", cause, sourceRef)18    Assertions.createAssertionError("message", sourceRef)19    Assertions.createAssertionError(cause, sourceRef)20    Assertions.createAssertionError(sourceRef)21    Exceptions.createAssertionError("message", cause, sourceRef)22    Exceptions.createAssertionError("message", sourceRef)23    Exceptions.createAssertionError(cause, sourceRef)24    Exceptions.createAssertionError(sourceRef)25    Assertions.createAssertionError("message", cause, sourceRef)26    Assertions.createAssertionError("message", sourceRef)27    Assertions.createAssertionError(cause, sourceRef)28    Assertions.createAssertionError(sourceRef)29    Exceptions.createAssertionError("message", cause, sourceRef)30    Exceptions.createAssertionError("message", sourceRef)31    Exceptions.createAssertionError(cause, sourceRef)32    Exceptions.createAssertionError(sourceRef)

createAssertionError

Using AI Code Generation

1result.shouldBeLessThan(5)2}3}4}5at io.kotest.assertions.ExceptionsKt.createAssertionError(Exceptions.kt:26)6at io.kotest.assertions.AssertionKt.assertion(Assertion.kt:25)7at io.kotest.assertions.AssertionKt.assertion$default(Assertion.kt:24)8at io.kotest.matchers.comparables.shouldBeLessThan(Comparables.kt:45)9at io.kotest.matchers.comparables.shouldBeLessThan$default(Comparables.kt:44)10at com.kotest.assertions.ExceptionAssertionsKtTest.should throw assertion error when assertion fails(ExceptionAssertionsKtTest.kt:22)11at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)12at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)13at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)14at java.lang.reflect.Method.invoke(Method.java:498)15at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)16at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)17at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)18at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)19at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)20at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)21at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)22at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)23at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)24at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)25at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)26at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)27at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)28at org.junit.runners.ParentRunner.run(ParentRunner.java:363)29at org.junit.runner.JUnitCore.run(JUnitCore.java:137)

createAssertionError

Using AI Code Generation

1val ex = Exceptions.createAssertionError(message)2println(ex.message)3val cause = NullPointerException()4val ex = Exceptions.createAssertionError(message, cause)5println(ex.message)6println(ex.cause)7val cause = NullPointerException()8val ex = Exceptions.createAssertionError(message, cause, true, true)9println(ex.message)10println(ex.cause)11println(ex.suppressed)12Recommended Posts: Kotlin | Exceptions.createIllegalStateException() method

createAssertionError

Using AI Code Generation

1class MyTest : StringSpec({2   "test" {3   }4})5class MyTest : StringSpec({6   "test" {7      if(a != b) {8         throw createAssertionError("a should be equal to b")9      }10   }11})

createAssertionError

Using AI Code Generation

1    throw Exceptions.createAssertionError(message)2}3fun main() {4    shouldThrow<AssertionError> {5        assertEquals(1, 2)6    }7}8fun assertEquals(expected: Int, actual: Int) {9    throw Exceptions.createAssertionError(message)10}11fun main() {12    shouldThrow<AssertionError> {13        assertEquals(1, 2)14    }15    shouldThrow<AssertionError> {16        assertEquals(1, 2)17    }.message shouldBe "Expected 2 to be 1"18}19fun assertEquals(expected: Int, actual: Int) {20    throw Exceptions.createAssertionError(message)21}22fun main() {23    shouldNotThrow<AssertionError> {24        assertEquals(1, 1)25    }26}

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